Mercurial > hg > truffle
annotate src/share/vm/opto/connode.cpp @ 628:7bb995fbd3c0
Merge
author | trims |
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date | Thu, 12 Mar 2009 18:16:36 -0700 |
parents | 98cb887364d3 |
children | 660978a2a31a |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // Optimization - Graph Style | |
26 | |
27 #include "incls/_precompiled.incl" | |
28 #include "incls/_connode.cpp.incl" | |
29 | |
30 //============================================================================= | |
31 //------------------------------hash------------------------------------------- | |
32 uint ConNode::hash() const { | |
33 return (uintptr_t)in(TypeFunc::Control) + _type->hash(); | |
34 } | |
35 | |
36 //------------------------------make------------------------------------------- | |
37 ConNode *ConNode::make( Compile* C, const Type *t ) { | |
38 switch( t->basic_type() ) { | |
39 case T_INT: return new (C, 1) ConINode( t->is_int() ); | |
40 case T_LONG: return new (C, 1) ConLNode( t->is_long() ); | |
41 case T_FLOAT: return new (C, 1) ConFNode( t->is_float_constant() ); | |
42 case T_DOUBLE: return new (C, 1) ConDNode( t->is_double_constant() ); | |
43 case T_VOID: return new (C, 1) ConNode ( Type::TOP ); | |
44 case T_OBJECT: return new (C, 1) ConPNode( t->is_oopptr() ); | |
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45 case T_ARRAY: return new (C, 1) ConPNode( t->is_aryptr() ); |
0 | 46 case T_ADDRESS: return new (C, 1) ConPNode( t->is_ptr() ); |
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47 case T_NARROWOOP: return new (C, 1) ConNNode( t->is_narrowoop() ); |
0 | 48 // Expected cases: TypePtr::NULL_PTR, any is_rawptr() |
49 // Also seen: AnyPtr(TopPTR *+top); from command line: | |
50 // r -XX:+PrintOpto -XX:CIStart=285 -XX:+CompileTheWorld -XX:CompileTheWorldStartAt=660 | |
51 // %%%% Stop using TypePtr::NULL_PTR to represent nulls: use either TypeRawPtr::NULL_PTR | |
52 // or else TypeOopPtr::NULL_PTR. Then set Type::_basic_type[AnyPtr] = T_ILLEGAL | |
53 } | |
54 ShouldNotReachHere(); | |
55 return NULL; | |
56 } | |
57 | |
58 //============================================================================= | |
59 /* | |
60 The major change is for CMoveP and StrComp. They have related but slightly | |
61 different problems. They both take in TWO oops which are both null-checked | |
62 independently before the using Node. After CCP removes the CastPP's they need | |
63 to pick up the guarding test edge - in this case TWO control edges. I tried | |
64 various solutions, all have problems: | |
65 | |
66 (1) Do nothing. This leads to a bug where we hoist a Load from a CMoveP or a | |
67 StrComp above a guarding null check. I've seen both cases in normal -Xcomp | |
68 testing. | |
69 | |
70 (2) Plug the control edge from 1 of the 2 oops in. Apparent problem here is | |
71 to figure out which test post-dominates. The real problem is that it doesn't | |
72 matter which one you pick. After you pick up, the dominating-test elider in | |
73 IGVN can remove the test and allow you to hoist up to the dominating test on | |
605 | 74 the chosen oop bypassing the test on the not-chosen oop. Seen in testing. |
0 | 75 Oops. |
76 | |
77 (3) Leave the CastPP's in. This makes the graph more accurate in some sense; | |
78 we get to keep around the knowledge that an oop is not-null after some test. | |
79 Alas, the CastPP's interfere with GVN (some values are the regular oop, some | |
80 are the CastPP of the oop, all merge at Phi's which cannot collapse, etc). | |
81 This cost us 10% on SpecJVM, even when I removed some of the more trivial | |
82 cases in the optimizer. Removing more useless Phi's started allowing Loads to | |
83 illegally float above null checks. I gave up on this approach. | |
84 | |
85 (4) Add BOTH control edges to both tests. Alas, too much code knows that | |
86 control edges are in slot-zero ONLY. Many quick asserts fail; no way to do | |
87 this one. Note that I really want to allow the CMoveP to float and add both | |
88 control edges to the dependent Load op - meaning I can select early but I | |
89 cannot Load until I pass both tests. | |
90 | |
91 (5) Do not hoist CMoveP and StrComp. To this end I added the v-call | |
92 depends_only_on_test(). No obvious performance loss on Spec, but we are | |
93 clearly conservative on CMoveP (also so on StrComp but that's unlikely to | |
94 matter ever). | |
95 | |
96 */ | |
97 | |
98 | |
99 //------------------------------Ideal------------------------------------------ | |
100 // Return a node which is more "ideal" than the current node. | |
101 // Move constants to the right. | |
102 Node *CMoveNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
103 if( in(0) && remove_dead_region(phase, can_reshape) ) return this; | |
305 | 104 // Don't bother trying to transform a dead node |
105 if( in(0) && in(0)->is_top() ) return NULL; | |
0 | 106 assert( !phase->eqv(in(Condition), this) && |
107 !phase->eqv(in(IfFalse), this) && | |
108 !phase->eqv(in(IfTrue), this), "dead loop in CMoveNode::Ideal" ); | |
109 if( phase->type(in(Condition)) == Type::TOP ) | |
110 return NULL; // return NULL when Condition is dead | |
111 | |
112 if( in(IfFalse)->is_Con() && !in(IfTrue)->is_Con() ) { | |
113 if( in(Condition)->is_Bool() ) { | |
114 BoolNode* b = in(Condition)->as_Bool(); | |
115 BoolNode* b2 = b->negate(phase); | |
116 return make( phase->C, in(Control), phase->transform(b2), in(IfTrue), in(IfFalse), _type ); | |
117 } | |
118 } | |
119 return NULL; | |
120 } | |
121 | |
122 //------------------------------is_cmove_id------------------------------------ | |
123 // Helper function to check for CMOVE identity. Shared with PhiNode::Identity | |
124 Node *CMoveNode::is_cmove_id( PhaseTransform *phase, Node *cmp, Node *t, Node *f, BoolNode *b ) { | |
125 // Check for Cmp'ing and CMove'ing same values | |
126 if( (phase->eqv(cmp->in(1),f) && | |
127 phase->eqv(cmp->in(2),t)) || | |
128 // Swapped Cmp is OK | |
129 (phase->eqv(cmp->in(2),f) && | |
130 phase->eqv(cmp->in(1),t)) ) { | |
131 // Check for "(t==f)?t:f;" and replace with "f" | |
132 if( b->_test._test == BoolTest::eq ) | |
133 return f; | |
134 // Allow the inverted case as well | |
135 // Check for "(t!=f)?t:f;" and replace with "t" | |
136 if( b->_test._test == BoolTest::ne ) | |
137 return t; | |
138 } | |
139 return NULL; | |
140 } | |
141 | |
142 //------------------------------Identity--------------------------------------- | |
143 // Conditional-move is an identity if both inputs are the same, or the test | |
144 // true or false. | |
145 Node *CMoveNode::Identity( PhaseTransform *phase ) { | |
146 if( phase->eqv(in(IfFalse),in(IfTrue)) ) // C-moving identical inputs? | |
147 return in(IfFalse); // Then it doesn't matter | |
148 if( phase->type(in(Condition)) == TypeInt::ZERO ) | |
149 return in(IfFalse); // Always pick left(false) input | |
150 if( phase->type(in(Condition)) == TypeInt::ONE ) | |
151 return in(IfTrue); // Always pick right(true) input | |
152 | |
153 // Check for CMove'ing a constant after comparing against the constant. | |
154 // Happens all the time now, since if we compare equality vs a constant in | |
155 // the parser, we "know" the variable is constant on one path and we force | |
156 // it. Thus code like "if( x==0 ) {/*EMPTY*/}" ends up inserting a | |
157 // conditional move: "x = (x==0)?0:x;". Yucko. This fix is slightly more | |
158 // general in that we don't need constants. | |
159 if( in(Condition)->is_Bool() ) { | |
160 BoolNode *b = in(Condition)->as_Bool(); | |
161 Node *cmp = b->in(1); | |
162 if( cmp->is_Cmp() ) { | |
163 Node *id = is_cmove_id( phase, cmp, in(IfTrue), in(IfFalse), b ); | |
164 if( id ) return id; | |
165 } | |
166 } | |
167 | |
168 return this; | |
169 } | |
170 | |
171 //------------------------------Value------------------------------------------ | |
172 // Result is the meet of inputs | |
173 const Type *CMoveNode::Value( PhaseTransform *phase ) const { | |
174 if( phase->type(in(Condition)) == Type::TOP ) | |
175 return Type::TOP; | |
176 return phase->type(in(IfFalse))->meet(phase->type(in(IfTrue))); | |
177 } | |
178 | |
179 //------------------------------make------------------------------------------- | |
180 // Make a correctly-flavored CMove. Since _type is directly determined | |
181 // from the inputs we do not need to specify it here. | |
182 CMoveNode *CMoveNode::make( Compile *C, Node *c, Node *bol, Node *left, Node *right, const Type *t ) { | |
183 switch( t->basic_type() ) { | |
184 case T_INT: return new (C, 4) CMoveINode( bol, left, right, t->is_int() ); | |
185 case T_FLOAT: return new (C, 4) CMoveFNode( bol, left, right, t ); | |
186 case T_DOUBLE: return new (C, 4) CMoveDNode( bol, left, right, t ); | |
187 case T_LONG: return new (C, 4) CMoveLNode( bol, left, right, t->is_long() ); | |
188 case T_OBJECT: return new (C, 4) CMovePNode( c, bol, left, right, t->is_oopptr() ); | |
189 case T_ADDRESS: return new (C, 4) CMovePNode( c, bol, left, right, t->is_ptr() ); | |
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190 case T_NARROWOOP: return new (C, 4) CMoveNNode( c, bol, left, right, t ); |
0 | 191 default: |
192 ShouldNotReachHere(); | |
193 return NULL; | |
194 } | |
195 } | |
196 | |
197 //============================================================================= | |
198 //------------------------------Ideal------------------------------------------ | |
199 // Return a node which is more "ideal" than the current node. | |
200 // Check for conversions to boolean | |
201 Node *CMoveINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
202 // Try generic ideal's first | |
203 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
204 if( x ) return x; | |
205 | |
206 // If zero is on the left (false-case, no-move-case) it must mean another | |
207 // constant is on the right (otherwise the shared CMove::Ideal code would | |
208 // have moved the constant to the right). This situation is bad for Intel | |
209 // and a don't-care for Sparc. It's bad for Intel because the zero has to | |
210 // be manifested in a register with a XOR which kills flags, which are live | |
211 // on input to the CMoveI, leading to a situation which causes excessive | |
212 // spilling on Intel. For Sparc, if the zero in on the left the Sparc will | |
213 // zero a register via G0 and conditionally-move the other constant. If the | |
214 // zero is on the right, the Sparc will load the first constant with a | |
215 // 13-bit set-lo and conditionally move G0. See bug 4677505. | |
216 if( phase->type(in(IfFalse)) == TypeInt::ZERO && !(phase->type(in(IfTrue)) == TypeInt::ZERO) ) { | |
217 if( in(Condition)->is_Bool() ) { | |
218 BoolNode* b = in(Condition)->as_Bool(); | |
219 BoolNode* b2 = b->negate(phase); | |
220 return make( phase->C, in(Control), phase->transform(b2), in(IfTrue), in(IfFalse), _type ); | |
221 } | |
222 } | |
223 | |
224 // Now check for booleans | |
225 int flip = 0; | |
226 | |
227 // Check for picking from zero/one | |
228 if( phase->type(in(IfFalse)) == TypeInt::ZERO && phase->type(in(IfTrue)) == TypeInt::ONE ) { | |
229 flip = 1 - flip; | |
230 } else if( phase->type(in(IfFalse)) == TypeInt::ONE && phase->type(in(IfTrue)) == TypeInt::ZERO ) { | |
231 } else return NULL; | |
232 | |
233 // Check for eq/ne test | |
234 if( !in(1)->is_Bool() ) return NULL; | |
235 BoolNode *bol = in(1)->as_Bool(); | |
236 if( bol->_test._test == BoolTest::eq ) { | |
237 } else if( bol->_test._test == BoolTest::ne ) { | |
238 flip = 1-flip; | |
239 } else return NULL; | |
240 | |
241 // Check for vs 0 or 1 | |
242 if( !bol->in(1)->is_Cmp() ) return NULL; | |
243 const CmpNode *cmp = bol->in(1)->as_Cmp(); | |
244 if( phase->type(cmp->in(2)) == TypeInt::ZERO ) { | |
245 } else if( phase->type(cmp->in(2)) == TypeInt::ONE ) { | |
246 // Allow cmp-vs-1 if the other input is bounded by 0-1 | |
247 if( phase->type(cmp->in(1)) != TypeInt::BOOL ) | |
248 return NULL; | |
249 flip = 1 - flip; | |
250 } else return NULL; | |
251 | |
252 // Convert to a bool (flipped) | |
253 // Build int->bool conversion | |
254 #ifndef PRODUCT | |
255 if( PrintOpto ) tty->print_cr("CMOV to I2B"); | |
256 #endif | |
257 Node *n = new (phase->C, 2) Conv2BNode( cmp->in(1) ); | |
258 if( flip ) | |
259 n = new (phase->C, 3) XorINode( phase->transform(n), phase->intcon(1) ); | |
260 | |
261 return n; | |
262 } | |
263 | |
264 //============================================================================= | |
265 //------------------------------Ideal------------------------------------------ | |
266 // Return a node which is more "ideal" than the current node. | |
267 // Check for absolute value | |
268 Node *CMoveFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
269 // Try generic ideal's first | |
270 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
271 if( x ) return x; | |
272 | |
273 int cmp_zero_idx = 0; // Index of compare input where to look for zero | |
274 int phi_x_idx = 0; // Index of phi input where to find naked x | |
275 | |
276 // Find the Bool | |
277 if( !in(1)->is_Bool() ) return NULL; | |
278 BoolNode *bol = in(1)->as_Bool(); | |
279 // Check bool sense | |
280 switch( bol->_test._test ) { | |
281 case BoolTest::lt: cmp_zero_idx = 1; phi_x_idx = IfTrue; break; | |
282 case BoolTest::le: cmp_zero_idx = 2; phi_x_idx = IfFalse; break; | |
283 case BoolTest::gt: cmp_zero_idx = 2; phi_x_idx = IfTrue; break; | |
284 case BoolTest::ge: cmp_zero_idx = 1; phi_x_idx = IfFalse; break; | |
285 default: return NULL; break; | |
286 } | |
287 | |
288 // Find zero input of CmpF; the other input is being abs'd | |
289 Node *cmpf = bol->in(1); | |
290 if( cmpf->Opcode() != Op_CmpF ) return NULL; | |
291 Node *X = NULL; | |
292 bool flip = false; | |
293 if( phase->type(cmpf->in(cmp_zero_idx)) == TypeF::ZERO ) { | |
294 X = cmpf->in(3 - cmp_zero_idx); | |
295 } else if (phase->type(cmpf->in(3 - cmp_zero_idx)) == TypeF::ZERO) { | |
296 // The test is inverted, we should invert the result... | |
297 X = cmpf->in(cmp_zero_idx); | |
298 flip = true; | |
299 } else { | |
300 return NULL; | |
301 } | |
302 | |
303 // If X is found on the appropriate phi input, find the subtract on the other | |
304 if( X != in(phi_x_idx) ) return NULL; | |
305 int phi_sub_idx = phi_x_idx == IfTrue ? IfFalse : IfTrue; | |
306 Node *sub = in(phi_sub_idx); | |
307 | |
308 // Allow only SubF(0,X) and fail out for all others; NegF is not OK | |
309 if( sub->Opcode() != Op_SubF || | |
310 sub->in(2) != X || | |
311 phase->type(sub->in(1)) != TypeF::ZERO ) return NULL; | |
312 | |
313 Node *abs = new (phase->C, 2) AbsFNode( X ); | |
314 if( flip ) | |
315 abs = new (phase->C, 3) SubFNode(sub->in(1), phase->transform(abs)); | |
316 | |
317 return abs; | |
318 } | |
319 | |
320 //============================================================================= | |
321 //------------------------------Ideal------------------------------------------ | |
322 // Return a node which is more "ideal" than the current node. | |
323 // Check for absolute value | |
324 Node *CMoveDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
325 // Try generic ideal's first | |
326 Node *x = CMoveNode::Ideal(phase, can_reshape); | |
327 if( x ) return x; | |
328 | |
329 int cmp_zero_idx = 0; // Index of compare input where to look for zero | |
330 int phi_x_idx = 0; // Index of phi input where to find naked x | |
331 | |
332 // Find the Bool | |
333 if( !in(1)->is_Bool() ) return NULL; | |
334 BoolNode *bol = in(1)->as_Bool(); | |
335 // Check bool sense | |
336 switch( bol->_test._test ) { | |
337 case BoolTest::lt: cmp_zero_idx = 1; phi_x_idx = IfTrue; break; | |
338 case BoolTest::le: cmp_zero_idx = 2; phi_x_idx = IfFalse; break; | |
339 case BoolTest::gt: cmp_zero_idx = 2; phi_x_idx = IfTrue; break; | |
340 case BoolTest::ge: cmp_zero_idx = 1; phi_x_idx = IfFalse; break; | |
341 default: return NULL; break; | |
342 } | |
343 | |
344 // Find zero input of CmpD; the other input is being abs'd | |
345 Node *cmpd = bol->in(1); | |
346 if( cmpd->Opcode() != Op_CmpD ) return NULL; | |
347 Node *X = NULL; | |
348 bool flip = false; | |
349 if( phase->type(cmpd->in(cmp_zero_idx)) == TypeD::ZERO ) { | |
350 X = cmpd->in(3 - cmp_zero_idx); | |
351 } else if (phase->type(cmpd->in(3 - cmp_zero_idx)) == TypeD::ZERO) { | |
352 // The test is inverted, we should invert the result... | |
353 X = cmpd->in(cmp_zero_idx); | |
354 flip = true; | |
355 } else { | |
356 return NULL; | |
357 } | |
358 | |
359 // If X is found on the appropriate phi input, find the subtract on the other | |
360 if( X != in(phi_x_idx) ) return NULL; | |
361 int phi_sub_idx = phi_x_idx == IfTrue ? IfFalse : IfTrue; | |
362 Node *sub = in(phi_sub_idx); | |
363 | |
364 // Allow only SubD(0,X) and fail out for all others; NegD is not OK | |
365 if( sub->Opcode() != Op_SubD || | |
366 sub->in(2) != X || | |
367 phase->type(sub->in(1)) != TypeD::ZERO ) return NULL; | |
368 | |
369 Node *abs = new (phase->C, 2) AbsDNode( X ); | |
370 if( flip ) | |
371 abs = new (phase->C, 3) SubDNode(sub->in(1), phase->transform(abs)); | |
372 | |
373 return abs; | |
374 } | |
375 | |
376 | |
377 //============================================================================= | |
378 // If input is already higher or equal to cast type, then this is an identity. | |
379 Node *ConstraintCastNode::Identity( PhaseTransform *phase ) { | |
380 return phase->type(in(1))->higher_equal(_type) ? in(1) : this; | |
381 } | |
382 | |
383 //------------------------------Value------------------------------------------ | |
384 // Take 'join' of input and cast-up type | |
385 const Type *ConstraintCastNode::Value( PhaseTransform *phase ) const { | |
386 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
387 const Type* ft = phase->type(in(1))->filter(_type); | |
388 | |
389 #ifdef ASSERT | |
390 // Previous versions of this function had some special case logic, | |
391 // which is no longer necessary. Make sure of the required effects. | |
392 switch (Opcode()) { | |
393 case Op_CastII: | |
394 { | |
395 const Type* t1 = phase->type(in(1)); | |
396 if( t1 == Type::TOP ) assert(ft == Type::TOP, "special case #1"); | |
397 const Type* rt = t1->join(_type); | |
398 if (rt->empty()) assert(ft == Type::TOP, "special case #2"); | |
399 break; | |
400 } | |
401 case Op_CastPP: | |
402 if (phase->type(in(1)) == TypePtr::NULL_PTR && | |
403 _type->isa_ptr() && _type->is_ptr()->_ptr == TypePtr::NotNull) | |
404 assert(ft == Type::TOP, "special case #3"); | |
405 break; | |
406 } | |
407 #endif //ASSERT | |
408 | |
409 return ft; | |
410 } | |
411 | |
412 //------------------------------Ideal------------------------------------------ | |
413 // Return a node which is more "ideal" than the current node. Strip out | |
414 // control copies | |
415 Node *ConstraintCastNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
416 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
417 } | |
418 | |
419 //------------------------------Ideal_DU_postCCP------------------------------- | |
420 // Throw away cast after constant propagation | |
421 Node *ConstraintCastNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { | |
422 const Type *t = ccp->type(in(1)); | |
423 ccp->hash_delete(this); | |
424 set_type(t); // Turn into ID function | |
425 ccp->hash_insert(this); | |
426 return this; | |
427 } | |
428 | |
429 | |
430 //============================================================================= | |
431 | |
432 //------------------------------Ideal_DU_postCCP------------------------------- | |
433 // If not converting int->oop, throw away cast after constant propagation | |
434 Node *CastPPNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { | |
435 const Type *t = ccp->type(in(1)); | |
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436 if (!t->isa_oop_ptr() || in(1)->is_DecodeN()) { |
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437 return NULL; // do not transform raw pointers or narrow oops |
0 | 438 } |
439 return ConstraintCastNode::Ideal_DU_postCCP(ccp); | |
440 } | |
441 | |
442 | |
443 | |
444 //============================================================================= | |
445 //------------------------------Identity--------------------------------------- | |
446 // If input is already higher or equal to cast type, then this is an identity. | |
447 Node *CheckCastPPNode::Identity( PhaseTransform *phase ) { | |
448 // Toned down to rescue meeting at a Phi 3 different oops all implementing | |
449 // the same interface. CompileTheWorld starting at 502, kd12rc1.zip. | |
450 return (phase->type(in(1)) == phase->type(this)) ? in(1) : this; | |
451 } | |
452 | |
453 // Determine whether "n" is a node which can cause an alias of one of its inputs. Node types | |
454 // which can create aliases are: CheckCastPP, Phi, and any store (if there is also a load from | |
455 // the location.) | |
456 // Note: this checks for aliases created in this compilation, not ones which may | |
457 // be potentially created at call sites. | |
458 static bool can_cause_alias(Node *n, PhaseTransform *phase) { | |
459 bool possible_alias = false; | |
460 | |
461 if (n->is_Store()) { | |
462 possible_alias = !n->as_Store()->value_never_loaded(phase); | |
463 } else { | |
464 int opc = n->Opcode(); | |
465 possible_alias = n->is_Phi() || | |
466 opc == Op_CheckCastPP || | |
467 opc == Op_StorePConditional || | |
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468 opc == Op_CompareAndSwapP || |
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469 opc == Op_CompareAndSwapN; |
0 | 470 } |
471 return possible_alias; | |
472 } | |
473 | |
474 //------------------------------Value------------------------------------------ | |
475 // Take 'join' of input and cast-up type, unless working with an Interface | |
476 const Type *CheckCastPPNode::Value( PhaseTransform *phase ) const { | |
477 if( in(0) && phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
478 | |
479 const Type *inn = phase->type(in(1)); | |
480 if( inn == Type::TOP ) return Type::TOP; // No information yet | |
481 | |
482 const TypePtr *in_type = inn->isa_ptr(); | |
483 const TypePtr *my_type = _type->isa_ptr(); | |
484 const Type *result = _type; | |
485 if( in_type != NULL && my_type != NULL ) { | |
486 TypePtr::PTR in_ptr = in_type->ptr(); | |
487 if( in_ptr == TypePtr::Null ) { | |
488 result = in_type; | |
489 } else if( in_ptr == TypePtr::Constant ) { | |
490 // Casting a constant oop to an interface? | |
491 // (i.e., a String to a Comparable?) | |
492 // Then return the interface. | |
493 const TypeOopPtr *jptr = my_type->isa_oopptr(); | |
494 assert( jptr, "" ); | |
495 result = (jptr->klass()->is_interface() || !in_type->higher_equal(_type)) | |
496 ? my_type->cast_to_ptr_type( TypePtr::NotNull ) | |
497 : in_type; | |
498 } else { | |
499 result = my_type->cast_to_ptr_type( my_type->join_ptr(in_ptr) ); | |
500 } | |
501 } | |
502 return result; | |
503 | |
504 // JOIN NOT DONE HERE BECAUSE OF INTERFACE ISSUES. | |
505 // FIX THIS (DO THE JOIN) WHEN UNION TYPES APPEAR! | |
506 | |
507 // | |
508 // Remove this code after overnight run indicates no performance | |
509 // loss from not performing JOIN at CheckCastPPNode | |
510 // | |
511 // const TypeInstPtr *in_oop = in->isa_instptr(); | |
512 // const TypeInstPtr *my_oop = _type->isa_instptr(); | |
513 // // If either input is an 'interface', return destination type | |
514 // assert (in_oop == NULL || in_oop->klass() != NULL, ""); | |
515 // assert (my_oop == NULL || my_oop->klass() != NULL, ""); | |
516 // if( (in_oop && in_oop->klass()->klass_part()->is_interface()) | |
517 // ||(my_oop && my_oop->klass()->klass_part()->is_interface()) ) { | |
518 // TypePtr::PTR in_ptr = in->isa_ptr() ? in->is_ptr()->_ptr : TypePtr::BotPTR; | |
519 // // Preserve cast away nullness for interfaces | |
520 // if( in_ptr == TypePtr::NotNull && my_oop && my_oop->_ptr == TypePtr::BotPTR ) { | |
521 // return my_oop->cast_to_ptr_type(TypePtr::NotNull); | |
522 // } | |
523 // return _type; | |
524 // } | |
525 // | |
526 // // Neither the input nor the destination type is an interface, | |
527 // | |
528 // // history: JOIN used to cause weird corner case bugs | |
529 // // return (in == TypeOopPtr::NULL_PTR) ? in : _type; | |
530 // // JOIN picks up NotNull in common instance-of/check-cast idioms, both oops. | |
531 // // JOIN does not preserve NotNull in other cases, e.g. RawPtr vs InstPtr | |
532 // const Type *join = in->join(_type); | |
533 // // Check if join preserved NotNull'ness for pointers | |
534 // if( join->isa_ptr() && _type->isa_ptr() ) { | |
535 // TypePtr::PTR join_ptr = join->is_ptr()->_ptr; | |
536 // TypePtr::PTR type_ptr = _type->is_ptr()->_ptr; | |
537 // // If there isn't any NotNull'ness to preserve | |
538 // // OR if join preserved NotNull'ness then return it | |
539 // if( type_ptr == TypePtr::BotPTR || type_ptr == TypePtr::Null || | |
540 // join_ptr == TypePtr::NotNull || join_ptr == TypePtr::Constant ) { | |
541 // return join; | |
542 // } | |
543 // // ELSE return same old type as before | |
544 // return _type; | |
545 // } | |
546 // // Not joining two pointers | |
547 // return join; | |
548 } | |
549 | |
550 //------------------------------Ideal------------------------------------------ | |
551 // Return a node which is more "ideal" than the current node. Strip out | |
552 // control copies | |
553 Node *CheckCastPPNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
554 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
555 } | |
556 | |
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557 |
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558 Node* DecodeNNode::Identity(PhaseTransform* phase) { |
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559 const Type *t = phase->type( in(1) ); |
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560 if( t == Type::TOP ) return in(1); |
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561 |
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562 if (in(1)->is_EncodeP()) { |
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563 // (DecodeN (EncodeP p)) -> p |
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564 return in(1)->in(1); |
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565 } |
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566 return this; |
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567 } |
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568 |
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569 const Type *DecodeNNode::Value( PhaseTransform *phase ) const { |
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570 const Type *t = phase->type( in(1) ); |
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571 if (t == Type::TOP) return Type::TOP; |
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572 if (t == TypeNarrowOop::NULL_PTR) return TypePtr::NULL_PTR; |
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573 |
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574 assert(t->isa_narrowoop(), "only narrowoop here"); |
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575 return t->make_ptr(); |
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576 } |
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577 |
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578 Node* EncodePNode::Identity(PhaseTransform* phase) { |
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579 const Type *t = phase->type( in(1) ); |
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580 if( t == Type::TOP ) return in(1); |
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581 |
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582 if (in(1)->is_DecodeN()) { |
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583 // (EncodeP (DecodeN p)) -> p |
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584 return in(1)->in(1); |
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585 } |
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586 return this; |
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587 } |
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588 |
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589 const Type *EncodePNode::Value( PhaseTransform *phase ) const { |
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590 const Type *t = phase->type( in(1) ); |
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591 if (t == Type::TOP) return Type::TOP; |
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592 if (t == TypePtr::NULL_PTR) return TypeNarrowOop::NULL_PTR; |
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593 |
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594 assert(t->isa_oopptr(), "only oopptr here"); |
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595 return t->make_narrowoop(); |
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596 } |
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597 |
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598 |
163 | 599 Node *EncodePNode::Ideal_DU_postCCP( PhaseCCP *ccp ) { |
600 return MemNode::Ideal_common_DU_postCCP(ccp, this, in(1)); | |
601 } | |
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602 |
0 | 603 //============================================================================= |
604 //------------------------------Identity--------------------------------------- | |
605 Node *Conv2BNode::Identity( PhaseTransform *phase ) { | |
606 const Type *t = phase->type( in(1) ); | |
607 if( t == Type::TOP ) return in(1); | |
608 if( t == TypeInt::ZERO ) return in(1); | |
609 if( t == TypeInt::ONE ) return in(1); | |
610 if( t == TypeInt::BOOL ) return in(1); | |
611 return this; | |
612 } | |
613 | |
614 //------------------------------Value------------------------------------------ | |
615 const Type *Conv2BNode::Value( PhaseTransform *phase ) const { | |
616 const Type *t = phase->type( in(1) ); | |
617 if( t == Type::TOP ) return Type::TOP; | |
618 if( t == TypeInt::ZERO ) return TypeInt::ZERO; | |
619 if( t == TypePtr::NULL_PTR ) return TypeInt::ZERO; | |
620 const TypePtr *tp = t->isa_ptr(); | |
621 if( tp != NULL ) { | |
622 if( tp->ptr() == TypePtr::AnyNull ) return Type::TOP; | |
623 if( tp->ptr() == TypePtr::Constant) return TypeInt::ONE; | |
624 if (tp->ptr() == TypePtr::NotNull) return TypeInt::ONE; | |
625 return TypeInt::BOOL; | |
626 } | |
627 if (t->base() != Type::Int) return TypeInt::BOOL; | |
628 const TypeInt *ti = t->is_int(); | |
629 if( ti->_hi < 0 || ti->_lo > 0 ) return TypeInt::ONE; | |
630 return TypeInt::BOOL; | |
631 } | |
632 | |
633 | |
634 // The conversions operations are all Alpha sorted. Please keep it that way! | |
635 //============================================================================= | |
636 //------------------------------Value------------------------------------------ | |
637 const Type *ConvD2FNode::Value( PhaseTransform *phase ) const { | |
638 const Type *t = phase->type( in(1) ); | |
639 if( t == Type::TOP ) return Type::TOP; | |
640 if( t == Type::DOUBLE ) return Type::FLOAT; | |
641 const TypeD *td = t->is_double_constant(); | |
642 return TypeF::make( (float)td->getd() ); | |
643 } | |
644 | |
645 //------------------------------Identity--------------------------------------- | |
646 // Float's can be converted to doubles with no loss of bits. Hence | |
647 // converting a float to a double and back to a float is a NOP. | |
648 Node *ConvD2FNode::Identity(PhaseTransform *phase) { | |
649 return (in(1)->Opcode() == Op_ConvF2D) ? in(1)->in(1) : this; | |
650 } | |
651 | |
652 //============================================================================= | |
653 //------------------------------Value------------------------------------------ | |
654 const Type *ConvD2INode::Value( PhaseTransform *phase ) const { | |
655 const Type *t = phase->type( in(1) ); | |
656 if( t == Type::TOP ) return Type::TOP; | |
657 if( t == Type::DOUBLE ) return TypeInt::INT; | |
658 const TypeD *td = t->is_double_constant(); | |
659 return TypeInt::make( SharedRuntime::d2i( td->getd() ) ); | |
660 } | |
661 | |
662 //------------------------------Ideal------------------------------------------ | |
663 // If converting to an int type, skip any rounding nodes | |
664 Node *ConvD2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
665 if( in(1)->Opcode() == Op_RoundDouble ) | |
666 set_req(1,in(1)->in(1)); | |
667 return NULL; | |
668 } | |
669 | |
670 //------------------------------Identity--------------------------------------- | |
671 // Int's can be converted to doubles with no loss of bits. Hence | |
672 // converting an integer to a double and back to an integer is a NOP. | |
673 Node *ConvD2INode::Identity(PhaseTransform *phase) { | |
674 return (in(1)->Opcode() == Op_ConvI2D) ? in(1)->in(1) : this; | |
675 } | |
676 | |
677 //============================================================================= | |
678 //------------------------------Value------------------------------------------ | |
679 const Type *ConvD2LNode::Value( PhaseTransform *phase ) const { | |
680 const Type *t = phase->type( in(1) ); | |
681 if( t == Type::TOP ) return Type::TOP; | |
682 if( t == Type::DOUBLE ) return TypeLong::LONG; | |
683 const TypeD *td = t->is_double_constant(); | |
684 return TypeLong::make( SharedRuntime::d2l( td->getd() ) ); | |
685 } | |
686 | |
687 //------------------------------Identity--------------------------------------- | |
688 Node *ConvD2LNode::Identity(PhaseTransform *phase) { | |
689 // Remove ConvD2L->ConvL2D->ConvD2L sequences. | |
690 if( in(1) ->Opcode() == Op_ConvL2D && | |
691 in(1)->in(1)->Opcode() == Op_ConvD2L ) | |
692 return in(1)->in(1); | |
693 return this; | |
694 } | |
695 | |
696 //------------------------------Ideal------------------------------------------ | |
697 // If converting to an int type, skip any rounding nodes | |
698 Node *ConvD2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
699 if( in(1)->Opcode() == Op_RoundDouble ) | |
700 set_req(1,in(1)->in(1)); | |
701 return NULL; | |
702 } | |
703 | |
704 //============================================================================= | |
705 //------------------------------Value------------------------------------------ | |
706 const Type *ConvF2DNode::Value( PhaseTransform *phase ) const { | |
707 const Type *t = phase->type( in(1) ); | |
708 if( t == Type::TOP ) return Type::TOP; | |
709 if( t == Type::FLOAT ) return Type::DOUBLE; | |
710 const TypeF *tf = t->is_float_constant(); | |
711 #ifndef IA64 | |
712 return TypeD::make( (double)tf->getf() ); | |
713 #else | |
714 float x = tf->getf(); | |
715 return TypeD::make( (x == 0.0f) ? (double)x : (double)x + ia64_double_zero ); | |
716 #endif | |
717 } | |
718 | |
719 //============================================================================= | |
720 //------------------------------Value------------------------------------------ | |
721 const Type *ConvF2INode::Value( PhaseTransform *phase ) const { | |
722 const Type *t = phase->type( in(1) ); | |
723 if( t == Type::TOP ) return Type::TOP; | |
724 if( t == Type::FLOAT ) return TypeInt::INT; | |
725 const TypeF *tf = t->is_float_constant(); | |
726 return TypeInt::make( SharedRuntime::f2i( tf->getf() ) ); | |
727 } | |
728 | |
729 //------------------------------Identity--------------------------------------- | |
730 Node *ConvF2INode::Identity(PhaseTransform *phase) { | |
731 // Remove ConvF2I->ConvI2F->ConvF2I sequences. | |
732 if( in(1) ->Opcode() == Op_ConvI2F && | |
733 in(1)->in(1)->Opcode() == Op_ConvF2I ) | |
734 return in(1)->in(1); | |
735 return this; | |
736 } | |
737 | |
738 //------------------------------Ideal------------------------------------------ | |
739 // If converting to an int type, skip any rounding nodes | |
740 Node *ConvF2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
741 if( in(1)->Opcode() == Op_RoundFloat ) | |
742 set_req(1,in(1)->in(1)); | |
743 return NULL; | |
744 } | |
745 | |
746 //============================================================================= | |
747 //------------------------------Value------------------------------------------ | |
748 const Type *ConvF2LNode::Value( PhaseTransform *phase ) const { | |
749 const Type *t = phase->type( in(1) ); | |
750 if( t == Type::TOP ) return Type::TOP; | |
751 if( t == Type::FLOAT ) return TypeLong::LONG; | |
752 const TypeF *tf = t->is_float_constant(); | |
753 return TypeLong::make( SharedRuntime::f2l( tf->getf() ) ); | |
754 } | |
755 | |
756 //------------------------------Identity--------------------------------------- | |
757 Node *ConvF2LNode::Identity(PhaseTransform *phase) { | |
758 // Remove ConvF2L->ConvL2F->ConvF2L sequences. | |
759 if( in(1) ->Opcode() == Op_ConvL2F && | |
760 in(1)->in(1)->Opcode() == Op_ConvF2L ) | |
761 return in(1)->in(1); | |
762 return this; | |
763 } | |
764 | |
765 //------------------------------Ideal------------------------------------------ | |
766 // If converting to an int type, skip any rounding nodes | |
767 Node *ConvF2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
768 if( in(1)->Opcode() == Op_RoundFloat ) | |
769 set_req(1,in(1)->in(1)); | |
770 return NULL; | |
771 } | |
772 | |
773 //============================================================================= | |
774 //------------------------------Value------------------------------------------ | |
775 const Type *ConvI2DNode::Value( PhaseTransform *phase ) const { | |
776 const Type *t = phase->type( in(1) ); | |
777 if( t == Type::TOP ) return Type::TOP; | |
778 const TypeInt *ti = t->is_int(); | |
779 if( ti->is_con() ) return TypeD::make( (double)ti->get_con() ); | |
780 return bottom_type(); | |
781 } | |
782 | |
783 //============================================================================= | |
784 //------------------------------Value------------------------------------------ | |
785 const Type *ConvI2FNode::Value( PhaseTransform *phase ) const { | |
786 const Type *t = phase->type( in(1) ); | |
787 if( t == Type::TOP ) return Type::TOP; | |
788 const TypeInt *ti = t->is_int(); | |
789 if( ti->is_con() ) return TypeF::make( (float)ti->get_con() ); | |
790 return bottom_type(); | |
791 } | |
792 | |
793 //------------------------------Identity--------------------------------------- | |
794 Node *ConvI2FNode::Identity(PhaseTransform *phase) { | |
795 // Remove ConvI2F->ConvF2I->ConvI2F sequences. | |
796 if( in(1) ->Opcode() == Op_ConvF2I && | |
797 in(1)->in(1)->Opcode() == Op_ConvI2F ) | |
798 return in(1)->in(1); | |
799 return this; | |
800 } | |
801 | |
802 //============================================================================= | |
803 //------------------------------Value------------------------------------------ | |
804 const Type *ConvI2LNode::Value( PhaseTransform *phase ) const { | |
805 const Type *t = phase->type( in(1) ); | |
806 if( t == Type::TOP ) return Type::TOP; | |
807 const TypeInt *ti = t->is_int(); | |
808 const Type* tl = TypeLong::make(ti->_lo, ti->_hi, ti->_widen); | |
809 // Join my declared type against my incoming type. | |
810 tl = tl->filter(_type); | |
811 return tl; | |
812 } | |
813 | |
814 #ifdef _LP64 | |
815 static inline bool long_ranges_overlap(jlong lo1, jlong hi1, | |
816 jlong lo2, jlong hi2) { | |
817 // Two ranges overlap iff one range's low point falls in the other range. | |
818 return (lo2 <= lo1 && lo1 <= hi2) || (lo1 <= lo2 && lo2 <= hi1); | |
819 } | |
820 #endif | |
821 | |
822 //------------------------------Ideal------------------------------------------ | |
823 Node *ConvI2LNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
824 const TypeLong* this_type = this->type()->is_long(); | |
825 Node* this_changed = NULL; | |
826 | |
827 // If _major_progress, then more loop optimizations follow. Do NOT | |
828 // remove this node's type assertion until no more loop ops can happen. | |
829 // The progress bit is set in the major loop optimizations THEN comes the | |
830 // call to IterGVN and any chance of hitting this code. Cf. Opaque1Node. | |
831 if (can_reshape && !phase->C->major_progress()) { | |
832 const TypeInt* in_type = phase->type(in(1))->isa_int(); | |
833 if (in_type != NULL && this_type != NULL && | |
834 (in_type->_lo != this_type->_lo || | |
835 in_type->_hi != this_type->_hi)) { | |
836 // Although this WORSENS the type, it increases GVN opportunities, | |
837 // because I2L nodes with the same input will common up, regardless | |
838 // of slightly differing type assertions. Such slight differences | |
839 // arise routinely as a result of loop unrolling, so this is a | |
840 // post-unrolling graph cleanup. Choose a type which depends only | |
841 // on my input. (Exception: Keep a range assertion of >=0 or <0.) | |
842 jlong lo1 = this_type->_lo; | |
843 jlong hi1 = this_type->_hi; | |
844 int w1 = this_type->_widen; | |
845 if (lo1 != (jint)lo1 || | |
846 hi1 != (jint)hi1 || | |
847 lo1 > hi1) { | |
848 // Overflow leads to wraparound, wraparound leads to range saturation. | |
849 lo1 = min_jint; hi1 = max_jint; | |
850 } else if (lo1 >= 0) { | |
851 // Keep a range assertion of >=0. | |
852 lo1 = 0; hi1 = max_jint; | |
853 } else if (hi1 < 0) { | |
854 // Keep a range assertion of <0. | |
855 lo1 = min_jint; hi1 = -1; | |
856 } else { | |
857 lo1 = min_jint; hi1 = max_jint; | |
858 } | |
859 const TypeLong* wtype = TypeLong::make(MAX2((jlong)in_type->_lo, lo1), | |
860 MIN2((jlong)in_type->_hi, hi1), | |
861 MAX2((int)in_type->_widen, w1)); | |
862 if (wtype != type()) { | |
863 set_type(wtype); | |
864 // Note: this_type still has old type value, for the logic below. | |
865 this_changed = this; | |
866 } | |
867 } | |
868 } | |
869 | |
870 #ifdef _LP64 | |
871 // Convert ConvI2L(AddI(x, y)) to AddL(ConvI2L(x), ConvI2L(y)) , | |
872 // but only if x and y have subranges that cannot cause 32-bit overflow, | |
873 // under the assumption that x+y is in my own subrange this->type(). | |
874 | |
875 // This assumption is based on a constraint (i.e., type assertion) | |
876 // established in Parse::array_addressing or perhaps elsewhere. | |
877 // This constraint has been adjoined to the "natural" type of | |
878 // the incoming argument in(0). We know (because of runtime | |
879 // checks) - that the result value I2L(x+y) is in the joined range. | |
880 // Hence we can restrict the incoming terms (x, y) to values such | |
881 // that their sum also lands in that range. | |
882 | |
883 // This optimization is useful only on 64-bit systems, where we hope | |
884 // the addition will end up subsumed in an addressing mode. | |
885 // It is necessary to do this when optimizing an unrolled array | |
886 // copy loop such as x[i++] = y[i++]. | |
887 | |
888 // On 32-bit systems, it's better to perform as much 32-bit math as | |
889 // possible before the I2L conversion, because 32-bit math is cheaper. | |
890 // There's no common reason to "leak" a constant offset through the I2L. | |
891 // Addressing arithmetic will not absorb it as part of a 64-bit AddL. | |
892 | |
893 Node* z = in(1); | |
894 int op = z->Opcode(); | |
895 if (op == Op_AddI || op == Op_SubI) { | |
896 Node* x = z->in(1); | |
897 Node* y = z->in(2); | |
898 assert (x != z && y != z, "dead loop in ConvI2LNode::Ideal"); | |
899 if (phase->type(x) == Type::TOP) return this_changed; | |
900 if (phase->type(y) == Type::TOP) return this_changed; | |
901 const TypeInt* tx = phase->type(x)->is_int(); | |
902 const TypeInt* ty = phase->type(y)->is_int(); | |
903 const TypeLong* tz = this_type; | |
904 jlong xlo = tx->_lo; | |
905 jlong xhi = tx->_hi; | |
906 jlong ylo = ty->_lo; | |
907 jlong yhi = ty->_hi; | |
908 jlong zlo = tz->_lo; | |
909 jlong zhi = tz->_hi; | |
910 jlong vbit = CONST64(1) << BitsPerInt; | |
911 int widen = MAX2(tx->_widen, ty->_widen); | |
912 if (op == Op_SubI) { | |
913 jlong ylo0 = ylo; | |
914 ylo = -yhi; | |
915 yhi = -ylo0; | |
916 } | |
917 // See if x+y can cause positive overflow into z+2**32 | |
918 if (long_ranges_overlap(xlo+ylo, xhi+yhi, zlo+vbit, zhi+vbit)) { | |
919 return this_changed; | |
920 } | |
921 // See if x+y can cause negative overflow into z-2**32 | |
922 if (long_ranges_overlap(xlo+ylo, xhi+yhi, zlo-vbit, zhi-vbit)) { | |
923 return this_changed; | |
924 } | |
925 // Now it's always safe to assume x+y does not overflow. | |
926 // This is true even if some pairs x,y might cause overflow, as long | |
927 // as that overflow value cannot fall into [zlo,zhi]. | |
928 | |
929 // Confident that the arithmetic is "as if infinite precision", | |
930 // we can now use z's range to put constraints on those of x and y. | |
931 // The "natural" range of x [xlo,xhi] can perhaps be narrowed to a | |
932 // more "restricted" range by intersecting [xlo,xhi] with the | |
933 // range obtained by subtracting y's range from the asserted range | |
934 // of the I2L conversion. Here's the interval arithmetic algebra: | |
935 // x == z-y == [zlo,zhi]-[ylo,yhi] == [zlo,zhi]+[-yhi,-ylo] | |
936 // => x in [zlo-yhi, zhi-ylo] | |
937 // => x in [zlo-yhi, zhi-ylo] INTERSECT [xlo,xhi] | |
938 // => x in [xlo MAX zlo-yhi, xhi MIN zhi-ylo] | |
939 jlong rxlo = MAX2(xlo, zlo - yhi); | |
940 jlong rxhi = MIN2(xhi, zhi - ylo); | |
941 // And similarly, x changing place with y: | |
942 jlong rylo = MAX2(ylo, zlo - xhi); | |
943 jlong ryhi = MIN2(yhi, zhi - xlo); | |
944 if (rxlo > rxhi || rylo > ryhi) { | |
945 return this_changed; // x or y is dying; don't mess w/ it | |
946 } | |
947 if (op == Op_SubI) { | |
948 jlong rylo0 = rylo; | |
949 rylo = -ryhi; | |
950 ryhi = -rylo0; | |
951 } | |
952 | |
953 Node* cx = phase->transform( new (phase->C, 2) ConvI2LNode(x, TypeLong::make(rxlo, rxhi, widen)) ); | |
954 Node* cy = phase->transform( new (phase->C, 2) ConvI2LNode(y, TypeLong::make(rylo, ryhi, widen)) ); | |
955 switch (op) { | |
956 case Op_AddI: return new (phase->C, 3) AddLNode(cx, cy); | |
957 case Op_SubI: return new (phase->C, 3) SubLNode(cx, cy); | |
958 default: ShouldNotReachHere(); | |
959 } | |
960 } | |
961 #endif //_LP64 | |
962 | |
963 return this_changed; | |
964 } | |
965 | |
966 //============================================================================= | |
967 //------------------------------Value------------------------------------------ | |
968 const Type *ConvL2DNode::Value( PhaseTransform *phase ) const { | |
969 const Type *t = phase->type( in(1) ); | |
970 if( t == Type::TOP ) return Type::TOP; | |
971 const TypeLong *tl = t->is_long(); | |
972 if( tl->is_con() ) return TypeD::make( (double)tl->get_con() ); | |
973 return bottom_type(); | |
974 } | |
975 | |
976 //============================================================================= | |
977 //------------------------------Value------------------------------------------ | |
978 const Type *ConvL2FNode::Value( PhaseTransform *phase ) const { | |
979 const Type *t = phase->type( in(1) ); | |
980 if( t == Type::TOP ) return Type::TOP; | |
981 const TypeLong *tl = t->is_long(); | |
982 if( tl->is_con() ) return TypeF::make( (float)tl->get_con() ); | |
983 return bottom_type(); | |
984 } | |
985 | |
986 //============================================================================= | |
987 //----------------------------Identity----------------------------------------- | |
988 Node *ConvL2INode::Identity( PhaseTransform *phase ) { | |
989 // Convert L2I(I2L(x)) => x | |
990 if (in(1)->Opcode() == Op_ConvI2L) return in(1)->in(1); | |
991 return this; | |
992 } | |
993 | |
994 //------------------------------Value------------------------------------------ | |
995 const Type *ConvL2INode::Value( PhaseTransform *phase ) const { | |
996 const Type *t = phase->type( in(1) ); | |
997 if( t == Type::TOP ) return Type::TOP; | |
998 const TypeLong *tl = t->is_long(); | |
999 if (tl->is_con()) | |
1000 // Easy case. | |
1001 return TypeInt::make((jint)tl->get_con()); | |
1002 return bottom_type(); | |
1003 } | |
1004 | |
1005 //------------------------------Ideal------------------------------------------ | |
1006 // Return a node which is more "ideal" than the current node. | |
1007 // Blow off prior masking to int | |
1008 Node *ConvL2INode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1009 Node *andl = in(1); | |
1010 uint andl_op = andl->Opcode(); | |
1011 if( andl_op == Op_AndL ) { | |
1012 // Blow off prior masking to int | |
1013 if( phase->type(andl->in(2)) == TypeLong::make( 0xFFFFFFFF ) ) { | |
1014 set_req(1,andl->in(1)); | |
1015 return this; | |
1016 } | |
1017 } | |
1018 | |
1019 // Swap with a prior add: convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y)) | |
1020 // This replaces an 'AddL' with an 'AddI'. | |
1021 if( andl_op == Op_AddL ) { | |
1022 // Don't do this for nodes which have more than one user since | |
1023 // we'll end up computing the long add anyway. | |
1024 if (andl->outcnt() > 1) return NULL; | |
1025 | |
1026 Node* x = andl->in(1); | |
1027 Node* y = andl->in(2); | |
1028 assert( x != andl && y != andl, "dead loop in ConvL2INode::Ideal" ); | |
1029 if (phase->type(x) == Type::TOP) return NULL; | |
1030 if (phase->type(y) == Type::TOP) return NULL; | |
1031 Node *add1 = phase->transform(new (phase->C, 2) ConvL2INode(x)); | |
1032 Node *add2 = phase->transform(new (phase->C, 2) ConvL2INode(y)); | |
1033 return new (phase->C, 3) AddINode(add1,add2); | |
1034 } | |
1035 | |
36 | 1036 // Disable optimization: LoadL->ConvL2I ==> LoadI. |
1037 // It causes problems (sizes of Load and Store nodes do not match) | |
1038 // in objects initialization code and Escape Analysis. | |
0 | 1039 return NULL; |
1040 } | |
1041 | |
1042 //============================================================================= | |
1043 //------------------------------Value------------------------------------------ | |
1044 const Type *CastX2PNode::Value( PhaseTransform *phase ) const { | |
1045 const Type* t = phase->type(in(1)); | |
1046 if (t->base() == Type_X && t->singleton()) { | |
1047 uintptr_t bits = (uintptr_t) t->is_intptr_t()->get_con(); | |
1048 if (bits == 0) return TypePtr::NULL_PTR; | |
1049 return TypeRawPtr::make((address) bits); | |
1050 } | |
1051 return CastX2PNode::bottom_type(); | |
1052 } | |
1053 | |
1054 //------------------------------Idealize--------------------------------------- | |
1055 static inline bool fits_in_int(const Type* t, bool but_not_min_int = false) { | |
1056 if (t == Type::TOP) return false; | |
1057 const TypeX* tl = t->is_intptr_t(); | |
1058 jint lo = min_jint; | |
1059 jint hi = max_jint; | |
1060 if (but_not_min_int) ++lo; // caller wants to negate the value w/o overflow | |
1061 return (tl->_lo >= lo) && (tl->_hi <= hi); | |
1062 } | |
1063 | |
1064 static inline Node* addP_of_X2P(PhaseGVN *phase, | |
1065 Node* base, | |
1066 Node* dispX, | |
1067 bool negate = false) { | |
1068 if (negate) { | |
1069 dispX = new (phase->C, 3) SubXNode(phase->MakeConX(0), phase->transform(dispX)); | |
1070 } | |
1071 return new (phase->C, 4) AddPNode(phase->C->top(), | |
1072 phase->transform(new (phase->C, 2) CastX2PNode(base)), | |
1073 phase->transform(dispX)); | |
1074 } | |
1075 | |
1076 Node *CastX2PNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1077 // convert CastX2P(AddX(x, y)) to AddP(CastX2P(x), y) if y fits in an int | |
1078 int op = in(1)->Opcode(); | |
1079 Node* x; | |
1080 Node* y; | |
1081 switch (op) { | |
1082 case Op_SubX: | |
1083 x = in(1)->in(1); | |
1084 y = in(1)->in(2); | |
1085 if (fits_in_int(phase->type(y), true)) { | |
1086 return addP_of_X2P(phase, x, y, true); | |
1087 } | |
1088 break; | |
1089 case Op_AddX: | |
1090 x = in(1)->in(1); | |
1091 y = in(1)->in(2); | |
1092 if (fits_in_int(phase->type(y))) { | |
1093 return addP_of_X2P(phase, x, y); | |
1094 } | |
1095 if (fits_in_int(phase->type(x))) { | |
1096 return addP_of_X2P(phase, y, x); | |
1097 } | |
1098 break; | |
1099 } | |
1100 return NULL; | |
1101 } | |
1102 | |
1103 //------------------------------Identity--------------------------------------- | |
1104 Node *CastX2PNode::Identity( PhaseTransform *phase ) { | |
1105 if (in(1)->Opcode() == Op_CastP2X) return in(1)->in(1); | |
1106 return this; | |
1107 } | |
1108 | |
1109 //============================================================================= | |
1110 //------------------------------Value------------------------------------------ | |
1111 const Type *CastP2XNode::Value( PhaseTransform *phase ) const { | |
1112 const Type* t = phase->type(in(1)); | |
1113 if (t->base() == Type::RawPtr && t->singleton()) { | |
1114 uintptr_t bits = (uintptr_t) t->is_rawptr()->get_con(); | |
1115 return TypeX::make(bits); | |
1116 } | |
1117 return CastP2XNode::bottom_type(); | |
1118 } | |
1119 | |
1120 Node *CastP2XNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1121 return (in(0) && remove_dead_region(phase, can_reshape)) ? this : NULL; | |
1122 } | |
1123 | |
1124 //------------------------------Identity--------------------------------------- | |
1125 Node *CastP2XNode::Identity( PhaseTransform *phase ) { | |
1126 if (in(1)->Opcode() == Op_CastX2P) return in(1)->in(1); | |
1127 return this; | |
1128 } | |
1129 | |
1130 | |
1131 //============================================================================= | |
1132 //------------------------------Identity--------------------------------------- | |
1133 // Remove redundant roundings | |
1134 Node *RoundFloatNode::Identity( PhaseTransform *phase ) { | |
1135 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel"); | |
1136 // Do not round constants | |
1137 if (phase->type(in(1))->base() == Type::FloatCon) return in(1); | |
1138 int op = in(1)->Opcode(); | |
1139 // Redundant rounding | |
1140 if( op == Op_RoundFloat ) return in(1); | |
1141 // Already rounded | |
1142 if( op == Op_Parm ) return in(1); | |
1143 if( op == Op_LoadF ) return in(1); | |
1144 return this; | |
1145 } | |
1146 | |
1147 //------------------------------Value------------------------------------------ | |
1148 const Type *RoundFloatNode::Value( PhaseTransform *phase ) const { | |
1149 return phase->type( in(1) ); | |
1150 } | |
1151 | |
1152 //============================================================================= | |
1153 //------------------------------Identity--------------------------------------- | |
1154 // Remove redundant roundings. Incoming arguments are already rounded. | |
1155 Node *RoundDoubleNode::Identity( PhaseTransform *phase ) { | |
1156 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel"); | |
1157 // Do not round constants | |
1158 if (phase->type(in(1))->base() == Type::DoubleCon) return in(1); | |
1159 int op = in(1)->Opcode(); | |
1160 // Redundant rounding | |
1161 if( op == Op_RoundDouble ) return in(1); | |
1162 // Already rounded | |
1163 if( op == Op_Parm ) return in(1); | |
1164 if( op == Op_LoadD ) return in(1); | |
1165 if( op == Op_ConvF2D ) return in(1); | |
1166 if( op == Op_ConvI2D ) return in(1); | |
1167 return this; | |
1168 } | |
1169 | |
1170 //------------------------------Value------------------------------------------ | |
1171 const Type *RoundDoubleNode::Value( PhaseTransform *phase ) const { | |
1172 return phase->type( in(1) ); | |
1173 } | |
1174 | |
1175 | |
1176 //============================================================================= | |
1177 // Do not allow value-numbering | |
1178 uint Opaque1Node::hash() const { return NO_HASH; } | |
1179 uint Opaque1Node::cmp( const Node &n ) const { | |
1180 return (&n == this); // Always fail except on self | |
1181 } | |
1182 | |
1183 //------------------------------Identity--------------------------------------- | |
1184 // If _major_progress, then more loop optimizations follow. Do NOT remove | |
1185 // the opaque Node until no more loop ops can happen. Note the timing of | |
1186 // _major_progress; it's set in the major loop optimizations THEN comes the | |
1187 // call to IterGVN and any chance of hitting this code. Hence there's no | |
1188 // phase-ordering problem with stripping Opaque1 in IGVN followed by some | |
1189 // more loop optimizations that require it. | |
1190 Node *Opaque1Node::Identity( PhaseTransform *phase ) { | |
1191 return phase->C->major_progress() ? this : in(1); | |
1192 } | |
1193 | |
1194 //============================================================================= | |
1195 // A node to prevent unwanted optimizations. Allows constant folding. Stops | |
1196 // value-numbering, most Ideal calls or Identity functions. This Node is | |
1197 // specifically designed to prevent the pre-increment value of a loop trip | |
1198 // counter from being live out of the bottom of the loop (hence causing the | |
1199 // pre- and post-increment values both being live and thus requiring an extra | |
1200 // temp register and an extra move). If we "accidentally" optimize through | |
1201 // this kind of a Node, we'll get slightly pessimal, but correct, code. Thus | |
1202 // it's OK to be slightly sloppy on optimizations here. | |
1203 | |
1204 // Do not allow value-numbering | |
1205 uint Opaque2Node::hash() const { return NO_HASH; } | |
1206 uint Opaque2Node::cmp( const Node &n ) const { | |
1207 return (&n == this); // Always fail except on self | |
1208 } | |
1209 | |
1210 | |
1211 //------------------------------Value------------------------------------------ | |
1212 const Type *MoveL2DNode::Value( PhaseTransform *phase ) const { | |
1213 const Type *t = phase->type( in(1) ); | |
1214 if( t == Type::TOP ) return Type::TOP; | |
1215 const TypeLong *tl = t->is_long(); | |
1216 if( !tl->is_con() ) return bottom_type(); | |
1217 JavaValue v; | |
1218 v.set_jlong(tl->get_con()); | |
1219 return TypeD::make( v.get_jdouble() ); | |
1220 } | |
1221 | |
1222 //------------------------------Value------------------------------------------ | |
1223 const Type *MoveI2FNode::Value( PhaseTransform *phase ) const { | |
1224 const Type *t = phase->type( in(1) ); | |
1225 if( t == Type::TOP ) return Type::TOP; | |
1226 const TypeInt *ti = t->is_int(); | |
1227 if( !ti->is_con() ) return bottom_type(); | |
1228 JavaValue v; | |
1229 v.set_jint(ti->get_con()); | |
1230 return TypeF::make( v.get_jfloat() ); | |
1231 } | |
1232 | |
1233 //------------------------------Value------------------------------------------ | |
1234 const Type *MoveF2INode::Value( PhaseTransform *phase ) const { | |
1235 const Type *t = phase->type( in(1) ); | |
1236 if( t == Type::TOP ) return Type::TOP; | |
1237 if( t == Type::FLOAT ) return TypeInt::INT; | |
1238 const TypeF *tf = t->is_float_constant(); | |
1239 JavaValue v; | |
1240 v.set_jfloat(tf->getf()); | |
1241 return TypeInt::make( v.get_jint() ); | |
1242 } | |
1243 | |
1244 //------------------------------Value------------------------------------------ | |
1245 const Type *MoveD2LNode::Value( PhaseTransform *phase ) const { | |
1246 const Type *t = phase->type( in(1) ); | |
1247 if( t == Type::TOP ) return Type::TOP; | |
1248 if( t == Type::DOUBLE ) return TypeLong::LONG; | |
1249 const TypeD *td = t->is_double_constant(); | |
1250 JavaValue v; | |
1251 v.set_jdouble(td->getd()); | |
1252 return TypeLong::make( v.get_jlong() ); | |
1253 } |